semicircular

/ˌsɛmiˈsɜːrkjələr/
adjective
  1. Shaped like half of a circle; having the form of an arc or curve that is 180 degrees.
    • She drew a semicircular line on the paper to represent the rainbow.
    • The ancient Roman theater was built in a semicircular shape for better acoustics.
    • The garden had a semicircular bench where people could sit and enjoy the view.
Antonyms
What does "semicircular" mean? | whatsthatwordmean | whatsthatwordmean